more correct form of dividing mmap & mmap_sa

git-svn-id: http://svn.miranda-ng.org/main/trunk@6953 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
now it's safe to forget about mmap_sa forever

git-svn-id: http://svn.miranda-ng.org/main/trunk@6954 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c